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Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation

A lab-scale ultrasound enhancing Anammox reactor (ABR(U)) was established and irradiated once a week by ultrasound with the optimal parameter (frequency of 25.0 kHz, intensity of 1.00 W cm(−2) and exposure time of 36.0 s) obtained by response surface methodology (RSM). ABR(U) and the controlled Anam...

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Detalles Bibliográficos
Autores principales: Yuan, Luzi, Wang, Tao, Xing, Fanghua, Wang, Xian, Yun, Hongying
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7848630/
https://www.ncbi.nlm.nih.gov/pubmed/33517095
http://dx.doi.org/10.1016/j.ultsonch.2021.105468
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author Yuan, Luzi
Wang, Tao
Xing, Fanghua
Wang, Xian
Yun, Hongying
author_facet Yuan, Luzi
Wang, Tao
Xing, Fanghua
Wang, Xian
Yun, Hongying
author_sort Yuan, Luzi
collection PubMed
description A lab-scale ultrasound enhancing Anammox reactor (ABR(U)) was established and irradiated once a week by ultrasound with the optimal parameter (frequency of 25.0 kHz, intensity of 1.00 W cm(−2) and exposure time of 36.0 s) obtained by response surface methodology (RSM). ABR(U) and the controlled Anammox reactor (ABR(C)) without ultrasonic treatment were operated in parallel. The start-up time of Anammox process in ABR(U) (59 d) was shorter than that in ABR(C) (69 d). At the end of the nitrogen load-enhancing period, NLR (0.500 kg N m(−3) d(−1)) and NRR (0.430 kg N m(−3) d(−1)) in ABR(U) were both higher than NLR (0.400 kg N m(−3) d(−1)) and NRR (0.333 kg N m(−3) d(−1)) in ABR(C). The results of RTQ-PCR demonstrated that the specific low-intensity ultrasound irradiation improved the enrichment levels of AnAOB in mature sludge. SEM images and the observation of the macroscopic morphology of mature sludge showed that the ultrasound irradiation strengthened the formation of Anammox granular sludge, thereby improved the interception capacity and impact load resistance of the reactor, and enhanced the nitrogen removal performance in ABR(U). The ultrasonic enhanced Anammox reactor based on an ABR with the optimal parameters can promote the rapid start-up and efficient and stable operation of the Anammox process at normal temperature (around 25.0 °C).
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spelling pubmed-78486302021-02-04 Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation Yuan, Luzi Wang, Tao Xing, Fanghua Wang, Xian Yun, Hongying Ultrason Sonochem Original Research Article A lab-scale ultrasound enhancing Anammox reactor (ABR(U)) was established and irradiated once a week by ultrasound with the optimal parameter (frequency of 25.0 kHz, intensity of 1.00 W cm(−2) and exposure time of 36.0 s) obtained by response surface methodology (RSM). ABR(U) and the controlled Anammox reactor (ABR(C)) without ultrasonic treatment were operated in parallel. The start-up time of Anammox process in ABR(U) (59 d) was shorter than that in ABR(C) (69 d). At the end of the nitrogen load-enhancing period, NLR (0.500 kg N m(−3) d(−1)) and NRR (0.430 kg N m(−3) d(−1)) in ABR(U) were both higher than NLR (0.400 kg N m(−3) d(−1)) and NRR (0.333 kg N m(−3) d(−1)) in ABR(C). The results of RTQ-PCR demonstrated that the specific low-intensity ultrasound irradiation improved the enrichment levels of AnAOB in mature sludge. SEM images and the observation of the macroscopic morphology of mature sludge showed that the ultrasound irradiation strengthened the formation of Anammox granular sludge, thereby improved the interception capacity and impact load resistance of the reactor, and enhanced the nitrogen removal performance in ABR(U). The ultrasonic enhanced Anammox reactor based on an ABR with the optimal parameters can promote the rapid start-up and efficient and stable operation of the Anammox process at normal temperature (around 25.0 °C). Elsevier 2021-01-21 /pmc/articles/PMC7848630/ /pubmed/33517095 http://dx.doi.org/10.1016/j.ultsonch.2021.105468 Text en © 2021 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research Article
Yuan, Luzi
Wang, Tao
Xing, Fanghua
Wang, Xian
Yun, Hongying
Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title_full Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title_fullStr Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title_full_unstemmed Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title_short Enhancement of Anammox performances in an ABR at normal temperature by the low-intensity ultrasonic irradiation
title_sort enhancement of anammox performances in an abr at normal temperature by the low-intensity ultrasonic irradiation
topic Original Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7848630/
https://www.ncbi.nlm.nih.gov/pubmed/33517095
http://dx.doi.org/10.1016/j.ultsonch.2021.105468
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